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PCM2906 Datasheet(PDF) 24 Page - Texas Instruments

Part # PCM2906
Description  STEREO AUDIO CODEC WITH USB INTERFACE, SINGLE-ENDED ANALOG INPUT/OUTPUT AND S/PDIF
PDF  39 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCM2906 Datasheet(HTML) 24 Page - Texas Instruments

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INTERFACE SEQUENCE
Power-On, Attach, and Playback Sequence
D+/D–
2.5V(Typ)
0V
InternalReset
ReadyforSetup
SOF
ReadyforPlayback
BusReset
SetConfiguration
SOF
SOF
BPZ
BusIdle
5V (Typ)
1
AudioData
st
2
AudioData
nd
V
(Pin3)
BUS
SSPND
V
L
OUT
V
R
OUT
700
s
m
DeviceSetup
1ms
T0055-02
Play, Stop, and Detach Sequence
Record Sequence
Suspend and Resume Sequence
PCM2904
PCM2906
SLES042C – JUNE 2002 – REVISED NOVEMBER 2007
The PCM2904/2906 is ready for setup when the reset sequence has finished and the USB device is attached.
After a connection has been established by setup, the PCM2904/PCM2906 is ready to accept USB audio data.
While waiting for the audio data (idle state), the analog output is set to bipolar zero (BPZ).
When receiving the audio data, the PCM2904/2906 stores the first audio packet, which contained 1-ms audio
data, into the internal storage buffer. The PCM2904/2906 starts playing the audio data when detecting the
following start-of-frame (SOF) packet.
Figure 32. Initial Sequence
When the host finishes or aborts the playback, the PCM2904/2906 stops playing after the last audio data has
played.
The PCM2904/2906 starts audio capture into the internal memory after receiving the SET_INTERFACE
command.
The PCM2904/2906 enters the suspend state after a constant idle state on the USB bus, approximately 5 ms.
While the PCM2904/2906 enters the suspend state, the SSPND flag (pin 28) is asserted. The PCM2904/2906
wakes up immediately on detecting a non-idle state on the USB.
24
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Copyright © 2002–2007, Texas Instruments Incorporated
Product Folder Link(s): PCM2904 PCM2906



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